خسار doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• خَسَارٌ

  خَسَارٌ خسار and , [both inf. ns. of خَسِرَ, q. v.,] (S,) and , (S, M, K, in some copies of the K written خَنْسَرَى, with ن, TA,) Error; or deviation from the right way: [like خُسْرَانٌ:] (S:) and perdition; or death; (S…

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